Apparatus and process for drying waxed paper



p 1941- c. M. RHODES ETAL 4 APPARATUS AND PROCESS FOR DRYING WAXED PAPER Filed Sept. 24, 1938 s Sheets-Sheet 1 A1 1 1941- v c. M. RHODES ETAL 0,315

APPARATUS .AND PROCESS FOR DRYING WAXED PAPER Filed Sept. 24, 1938 3 Sheets-Sheet 2 April 29, 1941. c. M. RHODES ETAL APPARATUS AND PROCESS FOR DRYING YIAXED PAPER Filed Sept. 24, 1938 3 Sheets-Sheet 3 Ly/e L. M ql'adre 4v Patented Apr. 29, 1941 APPARATUS AND PROCESS FOR DRYING WAXED PAPER Cecil M. Rhodes and Lyle L. McGladrey, St. Paul, Minn, assignors to Rapinwax Paper Company, Minneapolis, Minn., a corporation of Minnesota Application September 24, 1938, Serial No. 231,539

5 Claims.

he present invention relates to process and apparatus for removing from waxed paper, after the paper has passed through the regular water cooling bath and has been relieved of the bulk of the adhering water; the remaining moisture or dampness and to thoroughly dry the wax surface.

It is a common practice to attempt to remove the water from the waxed surface as by suction or mechanical scraping, but experience has proven that in the use of these well-known methods there is a residuum of moisture or dampness still adhering to the wax surface and the wax surface is not thoroughly dried, with the result that disintegration of the wax surface takes place when the paper has been folded and stored before it is used.

In the present invention, in addition to the step of mechanically removing the bulk of the water, as by squeezing, from the wax paper, the paper is, as a final step, passed between rollers which will take up any remaining moisture or dampness on the paper together with any loose particles of Wax.

In connection with these final rollers means are provided for constantly washing and cleaning the rollers and means in connection there with for constantly scraping and maintaining the surface of the rollers coming in contact with the paper in a cleaned and dry condition whereby to take up the moisture and dampness therefrom.

In the accompanying drawings;

Figure 1 is a front elevation of an apparatus for carrying out the invention;

Figure 2 is a side elevation of the apparatus, and

Figure 3 is a sectional view taken through the rollers and associated parts employed in carrying out the invention.

Referring to the drawings, A, represents the supporting frame work of the apparatus. Supported by the lower portion of the apparatus is the water compartment 2 within which is journaled the roller 3 over which the paper 4 passes after it has received, in the ordinary manner, the coating of wax. The water chamber 2 is the usual means for giving a cooling bath to harden the wax after the wax coating has been applied.

From the roller 3 the wax paper as shown in Figure 3 passes upwardly between the rollers 5 and 6 which squeeze the essential portion of water from the wax surface. Below the rollers 5 and 6 is supported in a suitable manner a trough member 1 formed with an upwardly extending flange 8 directed toward the paper below the rollers and a similarly directed flange 9 standing below the flange 8. The trough member 7 through its flanges 8 and 9 catches the water that is squeezed off the paper by the rollers 5 and 6. The water collected by the trough drains back into the tank 2 as hereinafter set forth. The squeezing rollers 5 and B accomplish the purpose of the ordinarily used scraping and suction means in removing the essential portion of the water but a certain amount of dampness is still left upon the waxed surface.

From the rollers 5 and 6 the paper passes to and between the rollers I U and II. Rollers II! and II are relatively large rollers of a special soft rubber character to thoroughly take up the remaining moisture from the wax paper and thoroughly dry the wax surface.

The roller positioned in the water tank is preferably a freely mounted roller. The roller 5 is journaled in the sides of the frame and has a driving belt connection I3 with a pulley I4 which pulley has intermeshing connection with the drive pulley I5 which drive pulley is connected with a source of power by a belt I6. The roller 6 as shown is a freely rotatable roller, adjustable with relation to the roller 5 as by standard adjusting means I1, conventionally shown. The roller I0 is freely supported in a journal bearing I8 supported in the frame work. The roller II has journal support 2| between brackets I9, which brackets have fulcrum support 20 in the frame work of the machine. The roller I I has a driving belt connection 22 with the drive wheel I5. A cam 22 supports the free ends of the brackets I9 and is operated by a handle 23. The cam may be turned by its handle to hold the brackets in the position shown in Figure 2 with the rollers Ill and II held in an engagement or actuated to hold the end of the brackets lowered with the roller II held out of engagement with the roller I I) to permit the placing of the paper between the rollers.

In order to constantly scour the rollers I0 and I I to remove the moisture and any particles of wax etc. collected by the rollers the following means are provided. Supported adjacent the outer sides of each of the rollers I0 and I I are the horizontally disposed pipes 24 and 25, these pipes being formed with discharge openings 26 and 21 directed toward the rollers. Supported below the pipes 24 and 25 are blades 26' and 21 directed toward and to the rollers and forming the bottom walls of troughs between the pipes and the rollers The troughs thus formed between the rollers l0 and II and the discharge pipes will be kept constantly filled with the liquid below the discharge openings so that the surface of the rollers passing through this liquid will be washed and any adhering particles of wax be taken up by the liquid. The plates 26' and 21' forming the bottom of these troughs will scrape and dry the surface of the rollers so as to maintain the surface of the rollers in a dry condition as the surface of the rollers thereafter come into contact with the waxpaper.

The liquid, preferably water, discharged from the pipes 24 and 25, may contain a suitable chemical to assist the cleaning action of the liquid as hereinafter set forth.

A container tank 29 for the cleaning liquid is supported near the bottom of the frame work,

the tank being connected by pipes 30 and 3| to the discharge pipes 24 and 25. The liquid is pumped from the tank through the pipes 30 and SI to the pipes 24 and 25, as by a motor pump 32., In operation, liquid from the tank is pumped to and discharged from the pipes 24 and 25 against the rollers to clean and scour the rollers. The liquid after cleaning the rollers will run off of the blades 28' and 2'! into the troughs 33 and 34.

From the troughs the liquid will pass through conduits 35, see Figure 2, to the upwardly extending portion of the tank 29. In this upwardly extended portion of the tank 29 may be supported a plurality of open work trays 36 through which the liquid will pass to the main portion of the tank. The trays act as receptacles in which may be deposited from time to time as desired, rejuvenating chemicals to maintain the strength of the cleaning liquid. The liquid is drawn up from the tank through the pipe 30 from a point below the top of the tank so that any contained wax will float upon the liquid above the discharge opening.

Any water caught by the trough 1 below the rollers 5 and 6 will drain back through the conduit 31 to the water tank. In the usual manner a stream of cold water will be fed to the water tank through a pipe 38 and be discharged through a pipe 39. The water from the tank 2 will pass over a suitable dam 40 to the discharge pipe. The dam maintains a proper level of water in the tank.

We claim:

1. An apparatus for removing the moisture from and drying a waxed sheet comprising a contacting pair of ordinary rubber rolls for squeezing a portion of the moisture from the paper as the paper is passed between the same, and a second pair of relatively soft surfaced rolls taking up the residual moisture from the paper as the paper is drawn between the same, and means for scraping the surface of said soft surface rolls after they have received the final moisture from the paper.

2. The method of removing moisture from and drying a wax sheet consisting of passing the moistened sheet between ordinary rubber rollers to squeeze a portion of the moisture from the sheet, thence passing the paper between larger soft surfaced rolls, the rolls taking up the remaining moisture and any waxed particles from the paper, and thence scraping from the soft surface rolls, the moisture and waxed particles being taken up by said rolls.

3. The method of moving residual moisture from waxed paper after a portion of the moisture has been squeezed from the paper, consisting of passing the paper between soft surface rollers, and scraping and applying a bath of chemical fluid to the surface of said rollers after the moisture from the paper has been taken up by said rollers.

4. The method of removing residual moisture from wax paper and cleaning the moisture removing means consisting of passing a sheet of moist wax paper between contacting soft surfaced rollers and scraping and applying a bath of cleaning fluid to the surface of said rollers for the purpose set forth.

5. In combination with absorbent rollers adapted to receive the residual moisture from waxed paper, means for scraping and continuously applying a bath of chemical fluid to the surface of said rollers for the purpose set forth.

CECIL M. RHODES.

LYLE L. MCGLADREY. 

